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A platform for research: civil engineering, architecture and urbanism
High-performance polycarboxylate superplasticizer and preparation method thereof
The invention belongs to the technical field of concrete admixtures, and particularly relates to a high-performance polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the steps that firstly, in the polymerization process of maleic acid-triethanolamine monoester in alkenyl-terminated polyoxyethylene ether and acrylic acid, the polycarboxylate superplasticizer with the early strength effect is formed; meanwhile, a small amount of nano silicon dioxide is added in the polymerization process, the nano silicon dioxide is grafted into the polycarboxylic acid water reducing agent with the early strength effect through free radical polymerization, then the nano silicon dioxide and the hyperbranched polymer are modified to change the long-chain molecular structure and improve the molecular space volume; as the end of the hyperbranched polymer has a Y-shaped structure, the formed polycarboxylate superplasticizer with the multi-branched Y-shaped structure can increase steric hindrance between side chains of polycarboxylic acid, so that the tail ends of the side chains are in an extended state, and the adsorption thickness and the dispersion performance of the superplasticizer on cement particles are improved.
本发明属于混凝土外加剂技术领域，特别涉及一种高性能聚羧酸减水剂及其制备方法，本发明首先在马来酸‑三乙醇胺单酯在端烯基聚氧乙烯醚和丙烯酸聚合过程中，形成了具有早强效果的聚羧酸减水剂，同时在聚合的过程中再添加少量的纳米二氧化硅，通过自由基聚合枝接到具有早强效果的聚羧酸减水剂中，然后再将其与超支化聚合物进行改性，改变长链式的分子结构，提高分子空间体积，由于超支化聚合物端部具有Y型结构，形成的多支化Y型结构的聚羧酸减水剂能够增加聚羧酸侧链间的空间位阻，使侧链末端呈伸展状态，增加了减水剂在水泥颗粒上的吸附厚度和分散性能。
High-performance polycarboxylate superplasticizer and preparation method thereof
The invention belongs to the technical field of concrete admixtures, and particularly relates to a high-performance polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises the steps that firstly, in the polymerization process of maleic acid-triethanolamine monoester in alkenyl-terminated polyoxyethylene ether and acrylic acid, the polycarboxylate superplasticizer with the early strength effect is formed; meanwhile, a small amount of nano silicon dioxide is added in the polymerization process, the nano silicon dioxide is grafted into the polycarboxylic acid water reducing agent with the early strength effect through free radical polymerization, then the nano silicon dioxide and the hyperbranched polymer are modified to change the long-chain molecular structure and improve the molecular space volume; as the end of the hyperbranched polymer has a Y-shaped structure, the formed polycarboxylate superplasticizer with the multi-branched Y-shaped structure can increase steric hindrance between side chains of polycarboxylic acid, so that the tail ends of the side chains are in an extended state, and the adsorption thickness and the dispersion performance of the superplasticizer on cement particles are improved.
本发明属于混凝土外加剂技术领域，特别涉及一种高性能聚羧酸减水剂及其制备方法，本发明首先在马来酸‑三乙醇胺单酯在端烯基聚氧乙烯醚和丙烯酸聚合过程中，形成了具有早强效果的聚羧酸减水剂，同时在聚合的过程中再添加少量的纳米二氧化硅，通过自由基聚合枝接到具有早强效果的聚羧酸减水剂中，然后再将其与超支化聚合物进行改性，改变长链式的分子结构，提高分子空间体积，由于超支化聚合物端部具有Y型结构，形成的多支化Y型结构的聚羧酸减水剂能够增加聚羧酸侧链间的空间位阻，使侧链末端呈伸展状态，增加了减水剂在水泥颗粒上的吸附厚度和分散性能。
High-performance polycarboxylate superplasticizer and preparation method thereof
一种高性能聚羧酸减水剂及其制备方法
HUANG WENMING (author) / WANG GUOLIANG (author) / LIU JUN (author) / WEI YUNCHAO (author)
2021-11-26
Patent
Electronic Resource
Chinese
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